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(NoModL) H. M. BYLLESBY Kz P. L ANGE.

INGANDESOBNT LAMP.

No.'383,616. Patented May 29, 188 8.

UNITED STATES PATENT OFFICE.

HENRY M. BYLLESBY AND PHILIP LANGE, OF PITTSBURG, PENNSYLVANIA,ASSIGNORS TO THE WESTINGHOUSE ELECTRIC COMPANY, OF SAME PLACE.

INCANDESCENT LAM P.

$PBCIPICATION forming part of Letters Patent No. 383,616, dated May 29,1888.

Application filed September 1, 1887. Serial No. 248,462. (No model.)

To all whom it may concern.-

Be it known that we, HENRY M. BYLLESBY and PHILIP LANGE, citizens of theUnited States, residing in Pittsburg, in the county of Allegheny andState of Pennsylvania, have invented certain new and useful Improvementsin Lamp-Bottoms, of which the following is a specification.

The invention relates to the construction of the bottoms or caps appliedto the necks of incandescent-electric-lamp globes for the purpose ofattaching them to their sockets and securing electrical connections withthe fila ments.

The invention consists, generally, in applying to the neck of thelarnp ametallic thimble, in the bottom of which there is placed a glass plateor block carrying a central contact-point secured in position by turningthe end of the thimble upon its edge. One of the leading-in wires fromthe filament is led along the side of the glass block,and is secured tothe outer metallic ring or thimble by soldering. The other leading-inwire is led through an aperture in the central contact, and it issoldered at its outer end.

In the accompanying drawings, Figure 1 is a vertical section of alamp-bottom embodying the features of the invention, and Fig. 2 is anend view of the lamp-bottom.

Referring to the figures, A represents th globe of an incandescentelectric lamp, and B its filament. The filament is supported on the twoleading-in wires 0 and 0 which lead through the neck of the lamp and outthrough the wall, as shown at d d To the neck of the lamp there isapplied a thimble, E, of brass or other suitable metal, and it iscemented upon the lamp, as shown at e. For the purpose of holding thecement securely, an annular lug, e, is thrown out upon the thimble. Thisreceives the cement and prevents it from slipping out and the thimblefrom being displaced. A second annular lug, e is pressed into thethimble at the proper point for receiving the inner edge 'of a block, F,of glass. This block carries a central contact in the block F, and itsinner end is expanded over the inner surface of the block. A shoulder,it, upon the pin rests against the outer surface of the block F, and inthis manner the .pin is securely held in position.

One of the leading-in wires, (1, leads through the perforation h to theouter end of the pin H, and is there secured bya drop of solder, k, orin any other convenient manner, forming a curved or rounded surface.

The pin His formed with a narrowing neck, If, for receivingcontact-springs when. it is ap plied to the holder.

The second leading-in wire, (P, is led be tween the glass block F andthe metallic thimble E to the outer edge, and is there secured bysoldering, thus insuring perfect electrical connection.

By using the glass plate F it is found that not only are the electrodessecurely insulated from each other, but thelamp-bottom is unaffected bymoisture and by heat, and neither shrinks nor expands to any appreciableextent, and is more durable than the constructions heretofore proposed.

By passing the leading-in wire d through the entire length of the pin Hcontact is made throughout a considerable length of the metal, and thussure and reliable electrical connections are formed. The solder at theend protects the parts. Likewise the conductor d, passing in metalliccontact with the thimble E, is placed in good electrical connection withthat thimble.

We claim as our invention- 1. The combination, with the globe oftraincandescent-electric lamp, of a metallic thimble secured thereto, aglass block spun or otherwise fastened into the end of the thimble, acentral contact-pin having a neck extending through the center of theglass block and expanded upon its inner surface, and having a shoulderresting upon the outer surface of the block, and having a perforationthrough its length, and the leading-in wire passing through saidperforation and soldered at the outer end of the pin.

2. The combination, with a thimble for incandescent-electric lamp bulbs,of a non-conducting bottom block spun or otherwise fast- I In testimonywhereof We have hereunto subened into the thimbie, and a centralcontact- I scribed our names this 1st day of J uiy, A. D. -10

pin having a neck extending through the cen- 1887.

ter of the block and expanded upon its inner HENRY M. BYLLESBY. 5surface, and having a shoulder resting upon PHILIP LANGE.

the outer surface of the block, and having a Witnesses:

W. D. UPTEGRAFF,

perforation through its length for receiving the CHARLES A. TERRY.

leading-in wire.

